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Question

The magnetic flux linked with a coil is given by the equation ϕ=2t28t+16. what will be the magnitude of flux linked with the coil, when induced emf in the coil is zero?

A
2 Wb
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B
4 Wb
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C
6 Wb
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D
8 Wb
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Solution

The correct option is D 8 Wb
Given,

ϕ=2t28t+16

emf induced in the coil is,

E=dϕdt=ddt(2t28t+16)=4t8

Induced emf will be zero when,

4t8=0

t=2 sec.

flux at t=2 sec. is

ϕ=2(2)28×2+16=8 Wb

Hence, option (D) is the correct answer.

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